[Xen-devel] [PATCH RFC 02/12] x86/np2m: add np2m_flush_eptp()

[Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>]

The new function finds all np2m objects with the specified eptp and
flushes them. p2m_flush_table_locked() is added in order not to release
the p2m lock after np2m_base check.

Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
---
 xen/arch/x86/mm/p2m.c     | 34 +++++++++++++++++++++++++++++++---
 xen/include/asm-x86/p2m.h |  2 ++
 2 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index b8c8bba421..bc330d8f52 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1708,15 +1708,14 @@ p2m_getlru_nestedp2m(struct domain *d, struct 
p2m_domain *p2m)
     return p2m;
 }
 
-/* Reset this p2m table to be empty */
 static void
-p2m_flush_table(struct p2m_domain *p2m)
+p2m_flush_table_locked(struct p2m_domain *p2m)
 {
     struct page_info *top, *pg;
     struct domain *d = p2m->domain;
     mfn_t mfn;
 
-    p2m_lock(p2m);
+    ASSERT(p2m_locked_by_me(p2m));
 
     /*
      * "Host" p2m tables can have shared entries &c that need a bit more care
@@ -1756,6 +1755,14 @@ p2m_flush_table(struct p2m_domain *p2m)
     p2m_unlock(p2m);
 }
 
+/* Reset this p2m table to be empty */
+static void
+p2m_flush_table(struct p2m_domain *p2m)
+{
+    p2m_lock(p2m);
+    p2m_flush_table_locked(p2m);
+}
+
 void
 p2m_flush(struct vcpu *v, struct p2m_domain *p2m)
 {
@@ -1773,6 +1780,27 @@ p2m_flush_nestedp2m(struct domain *d)
         p2m_flush_table(d->arch.nested_p2m[i]);
 }
 
+void np2m_flush_eptp(struct vcpu *v, unsigned long eptp)
+{
+    struct domain *d = v->domain;
+    struct p2m_domain *p2m;
+    unsigned int i;
+
+    eptp &= ~(0xfffull);
+
+    nestedp2m_lock(d);
+    for ( i = 0; i < MAX_NESTEDP2M; i++ )
+    {
+        p2m = d->arch.nested_p2m[i];
+        p2m_lock(p2m);
+        if ( p2m->np2m_base == eptp )
+            p2m_flush_table_locked(p2m);
+        else
+            p2m_unlock(p2m);
+    }
+    nestedp2m_unlock(d);
+}
+
 static void assign_np2m(struct vcpu *v, struct p2m_domain *p2m)
 {
     struct nestedvcpu *nv = &vcpu_nestedhvm(v);
diff --git a/xen/include/asm-x86/p2m.h b/xen/include/asm-x86/p2m.h
index 9086bb35dc..0e39999387 100644
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -779,6 +779,8 @@ int p2m_pt_handle_deferred_changes(uint64_t gpa);
 void p2m_flush(struct vcpu *v, struct p2m_domain *p2m);
 /* Flushes all nested p2m tables */
 void p2m_flush_nestedp2m(struct domain *d);
+/* Flushes all np2m objects with the specified eptp */
+void np2m_flush_eptp(struct vcpu *v, unsigned long eptp);
 
 void nestedp2m_write_p2m_entry(struct p2m_domain *p2m, unsigned long gfn,
     l1_pgentry_t *p, l1_pgentry_t new, unsigned int level);
-- 
2.11.0


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